Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
technology darg » technology data, technology during, technology 4ir
a developpement » au developpement, de developpement, le developpement
darg regional » deep regional
problems 6.2 » problems 2.2, problems 3.2, problems 6.1
des afrique » en afrique, de l'afrique
costs a » costs _, costs 4

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology darg regional urban problems 6.2 communication costs a developpement des afrique.*.